hepatic caeca in cockroach are useful in...
Hepatic ceacea is the part of mid gut of coackroach.
It is narrow, short and tubular portion originate from gizzard. At beginning it receives eight hepatic caeca hanging in haemocoel (body cavity filled with white colour blood), ending blindly but opening in gut.
ENZYMES FROM HEPATIC CAECA
They are lined by glandular cells, which secrete enzymes.
Enzymes from hepatic caeca and mid-gut flow back into crop where digestion takes place.
1. PEDTIDASES AND TRYPSIN LIKE ENZYME -> digest proteins.
2. AMYLASES -> complete digestion of starches
3. LIPASE -> digestion of fats.
Digested food form a bolus and enclosed in a thin chitinous tube secreted by stomodael valve of gizzard. This covering is called PERITROPHIC MEMBRANE.
It is permeable to enzymes and digested food. This membrane protects the lining of mid gut from damage by hard indigestible components of food.
Digested food is absorbed in mid gut.